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[DIY Automatic Water Refiller (EFY March 2018)]

DIY Automatic Water Refiller (EFY March 2018)
Air coolers  provide  cool  air  in a room by adding moisture to the air. This moist air is blown inside the room by an exhaust fan or blower, which makes the room temperature drop. These coolers require frequent refilling of water. Presented here is a circuit to refill water automatically in an air-cooler tank when the  water  drops  below  a  predetermined level. It is built around NE555 timer (IC1),  transistor  BC547  (T1),  reed switches (S1 and S2), and a few other components. IC1 is configured similar to bi-stable mode, the only difference being that switch S1 is connected to pin 6 instead of pin 4.

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Note	Interested in Learning PIXEL LED GUI Software Development. The Machine.id and Registration Generation. Successfully made the generation of Registration of 6,12,18 and working on 5. This becomes much intoduction

Hey guys,
I wonder if there are any AC output switchmode power supply?
Or is it even possible?

As far as I know it is possible. Transformers can be impractically heavy especially for mobile devices -a fact  that stood as a burden impeding further miniaturization of electronic devices for many decades. AC that we use today in our homes is merely 50/60Hz which requires a hefty size. The way SMTP achieves smaller sizes is through the increased increased efficiency that comes from higher frequencies involved. You can convert frequency either mechanically or electronically or try inverters. All of these existing solutions will usually result in bulkier and costlier implementations. Presently, SMTP stands out as the most logical option a: it is highly available, cheap, tried, tested and time proven.

If you can create a low cost, efficient AC to AC design for your device that will revolutionize the electronics world; you might as well forget about those 200 items and set out to promote that cutting edge power supply technology.

You can use PWM to create an AC form DC. This method is used by most modern power inverters. It will produce a good enough approximation to a sine wave in many cases. But if it is good enough for your load condition. I do not know. Anyway I found a free document here
https://digitalcommons.wpi.edu/cgi/viewcontent.cgi?article=1184&context=mqp-all

The devices used in the sim are only a token, to show it could work. it is not a finished project.

In works I have a good supply of 800 & 900 volt 60A Fets that are used in Microwave cookers.
we also have a supply for Induction Heaters. also high amps.

We have had a unit in the field using a similar design 12V 25A used 12hours a day for 18 years. 

@Parmin

Can you write some details as galvanic isolation, type of load, is output pure sine,...?







Posted on: June 01, 2020, 05:29:18 17:29 - Automerged

This works in proteus

If you use this try use a small dc power supply for the fet gates.
As it is you need to take care with high voltage that can harm you.

It is totall different topology from your first picture. First is impossible to work

Second design can work but for 200W, 24V-> 8A current, fets will burn for less than secs. Only way is pwm driving, but EMC for that design can be nightmare.

Easiest and more reliably way is standard DC psu, then inverter.

Best way is simple transformer good designed with quality core

This works in proteus

If you use this try use a small dc power supply for the fet gates.
As it is you need to take care with high voltage that can harm you.